How to file a case against SBI in consumer court?

Their was an ad showing fake offer price in the price of iphone 15 at 32000/- by some of the authorised apple store. and i bought it for 71000/- that they are saying their are so many conditions which they were not mentioned

Delhivery courier deliver a partial delivery out of 12 packages.. i waited for over 15 days for their complete delivery. It was only about 40 minutes drive away from its destination office to its ware house. Since it is not far awsy from its destination, I went to their ware house several times. But, every time i went or send someone for the same there, they never paid heed to my grievience... it is very very frustrating.. i am mentally hurt now...

On April 17, 2023 i traveled with my partner to china by singapore airlines, they lost my baggage still they did not find the luggage. i contacted the singapore airlines they are telling me to contact singapore airlines china they are telling me to contact police. i need to claim compensation for this